Reducing the time to tune parallel dense linear algebra routines with partial execution and performance modeling

  • Authors:
  • Piotr Luszczek;Jack Dongarra

  • Affiliations:
  • University of Tennessee, Knoxville, TN;University of Tennessee, Knoxville, TN, USA, Oak Ridge National Laboratory, USA, University of Manchester, United Kingdom

  • Venue:
  • PPAM'11 Proceedings of the 9th international conference on Parallel Processing and Applied Mathematics - Volume Part I
  • Year:
  • 2011

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Abstract

We present a modeling framework to accurately predict time to run dense linear algebra calculation. We report the framework's accuracy in a number of varied computational environments such as shared memory multicore systems, clusters, and large supercomputing installations with tens of thousands of cores. We also test the accuracy for various algorithms, each of which having a different scaling properties and tolerance to low-bandwidth/high-latency interconnects. The predictive accuracy is very good and on the order of measurement accuracy which makes the method suitable for both dedicated and non-dedicated environments. We also present a practical application of our model to reduce the time required to tune and optimize large parallel runs whose time is dominated by linear algebra computations. We show practical examples of how to apply the methodology to avoid common pitfalls and reduce the influence of measurement errors and the inherent performance variability.